Are we talking the PCS C block in the Bay Area? If so, MetroPCS holds the original PCS C block 30 MHz license, but that has been reduced to 20 MHz, as MetroPCS disaggregated part of the license, a C5 block 10 MHz to VZW.

On the other hand, if you are referring to the PCS C block in other markets or the AWS C block, the Upper 700 MHz C block, or the Lower 700 MHz C block, then it varies.

If you want to see T-Mobile's PCS 1900 MHz licenses and their arrangement for the top 100 markets, I put together this Google Docs spreadsheet: